Complex quantum optical circuitry Encoding and manipulating information in the states of single photons provides a potential platform for computing communication. Carolan et al. developed reconfigurable integrated waveguide device fabricated glass chip (see Perspective by Rohde Dowling). The allowed universal linear optics transformations on six wave-guides using 15 Mach-Zehnder interferometers, each which was individually programmable. Functional performance number applications demonstrates...

Abstract Photonic neuromorphic computing is of particular interest due to its significant potential for ultrahigh speed and energy efficiency. The advantage photonic hardware lies in ultrawide bandwidth parallel processing utilizing inherent parallelism. Here, we demonstrate a scalable on-chip implementation simplified recurrent neural network, called reservoir computer, using an integrated coherent linear processor. In contrast previous approaches, both the input weights are encoded...

Abstract Ever-growing demand for artificial intelligence has motivated research on unconventional computation based physical devices. While such devices mimic brain-inspired analog information processing, the learning procedures still rely methods optimized digital processing as backpropagation, which is not suitable implementation. Here, we present deep by extending a biologically inspired training algorithm called direct feedback alignment. Unlike original algorithm, proposed method random...

Image sensors play a critical role in current technologies ranging from smartphones to autonomous vehicles. In these technologies, high-sensitivity image are highly desired because they enable dark-scene/ultra-fast imaging. Unfortunately, conventional sensor architecture that employs color filters on every pixel fundamentally limits the detected light power per of filtering, which has been long-standing barrier sensitivity improvement. Here, we demonstrate polarization-insensitive...

Conventional color image sensors employing absorptive filters exhibit low overall light transmission, resulting in limited signal levels per sensor pixel. This issue is becoming critical because the amount of to detect at each pixel decreasing as size decreases. Here, we present a design for transparent, pixel-scale splitters based on dielectric metasurfaces and show advantages using them instead filters. We demonstrate that configurations with enhance detected by factor ∼3.57 compared...

We have studied the wavefront matching (WFM) method, which synthesizes optimum waveguide patterns from desired characteristics, and demonstrated its feasibility. In this paper, we expand method to create shapes with low-loss low-wavelength dependence in lenses, Y-branches, crossings. describe design procedures for each element report experimental results as proof of concept. The measured agree well our requirements, designed by WFM exhibit better characteristics than reference patterns.

High-speed digital-to-analog converters (DACs) are essential in advanced optical transmission systems, utilizing multilevel modulation formats and pulse-shaping technologies. Analog bandwidth of DACs is one the major limiting factors for system capacity. In this paper, we present an idea to extend analog by a digital preprocessor, two sub-DACs, multiplexer (AMUX). The AMUX high-speed linear selector, frequency-domain interpretation AMUX's function has led us devise preprocessing seamless...

Simple high-speed optical transmission technologies are desired for use in intra-and inter-datacenter networks. In this study, we demonstrate simple single-carrier intensity-modulated direct-detection (IMDD) transmissions at a net data rate of 400 Gbps (516.7 gross) over 20 km with compact transmitter subassembly. The subassembly consists 2:1 analog multiplexer (AMUX) and an InP Mach-Zehnder modulator (MZM) placed close to each other connected via wires. We employed 162-Gbaud...

Polarization imaging is key for various applications ranging from biology to machine vision because it can capture valuable optical information about imaged environments, which usually absent in intensity and spectral content. Conventional polarization cameras rely on a traditional single-eye system with rotating polarizers, cascaded optics, or micropolarizer-patterned image sensors. These cameras, however, have two common issues. The first low sensitivity resulting the limited light...

We propose an optical circuit design method for coherent waves as a boundary value problem. The produces very compact in which the refractive index pattern is automatically synthesized given input and output fields with numerical calculation. employ to 1.3?1.55??m wavelength demultiplexer also describe features of generated by use method.

We demonstrate a compact and variable-optical-attenuator (VOA) integrated coherent receiver with silica-based planar lightwave circuit (PLC). To realize the receiver, we integrate VOA in single PLC chip polarization beam splitters optical 90-degree hybrids, employ stable optoelectronic coupling system consisting of micro lens arrays photodiode (PD) subcarriers high-speed right-angled signal lines. 27x40x6 mm package, successfully demodulate 128-Gbit/s division multiplexed (PDM) quadrature...

Parity-time ($PT$) symmetric Hamiltonians are generally non-Hermitian and give rise to exotic behaviour in quantum systems at exceptional points, where eigenvectors coalesce. The recent realisation of $PT$-symmetric has ignited efforts simulate investigate many-particle across points. Here we use a programmable integrated photonic chip model comprised twin pairs Hamiltonians, with each the time reverse its twin. We dynamics points including two- three-particle interference,...

We demonstrate a new optical-domain bandwidth extension technology with simple optical configuration. use an integrated phase-interleaving in-phase-and-quadrature modulator (PI-IQM) consisting of differential phase followed by pair IQMs in combination 8-by-4 digital spectral weaver (DSW). With them, we can synthesize arbitrary signals bandwidths up to twice the analog digital-to-analog converters (DACs). The configuration is simpler than those conventional frequency- or time-interleaving...

We demonstrate a technique for generating high-quality optical signals at symbol rate twice the sampling of digital-to-analog converters (DACs). Optical time-division multiplexing (OTDM) with carrier-suppressed return-to-zero (CSRZ) wave doubles in spectrally efficient manner. An 8×4 digital calibrator effectively compensates spurious spectral components CSRZ waveform, relaxing required accuracy pulse generator and enhancing signal integrity. implemented 224-GBaud CSRZ-OTDM transmitter...

We proposed an ultra-wide-band DAC configuration consisting of a digital preprocessor, two sub-DACs, and analog multiplexer. The output bandwidth is nearly doubled from that the sub-DACs. idea was verified by 160-Gbps Nyquist PAM4 transmission.

We demonstrate intensity-modulated direct-detection optical transmission at a record-high data rate with single wavelength and polarization. The high is achieved simple optics by using electronic electrooptic devices large operation bandwidths. use digital-preprocessed analog-multiplexed digital-to-analog converter >100-GHz analog multiplexer (AMUX) to drive an 80-GHz Mach-Zehnder modulator (MZM). AMUX based on 0.25-μm-emitter-width InP heterojunction bipolar transistor technology, the MZM...

We show a new family of neural networks based on the Schr\"{o}dinger equation (SE-NET). In this analogy, trainable weights correspond to physical quantities equation. These can be trained using complex-valued adjoint method. Since propagation SE-NET described by evolution systems, its outputs computed solver. As demonstration, we implemented finite difference The network is transferable actual optical systems. Based concept, numerical demonstration end-to-end machine learning with an...

A two-step bonding technique for optical device assembly on a planar lightwave circuit platform was developed, which consists of chip-by-chip thermo-compression prebonding step and simultaneous reflow step. The used to realize multichip integration the platform. characteristics were examined by investigating its strength accuracy. accuracies in horizontal vertical directions 1.1 0.8 /spl mu/m, respectively, with high strength. first applied 3 chip integrated transceiver module 136 fabricated...

We demonstrate the first single-lane intensity-modulated direct-detection (IMDD) optical transmission at a net data rate of 250 Gb/s. A discrete multi-tone (DMT) signal gross line 300 Gb/s can be generated with digital-preprocessed analog-multiplexed digital-to-analog converter (DP-AM-DAC), which consists digital preprocessor, two sub-DACs, and an analog multiplexer (AMUX). show new scheme to relax required clock frequency drive AMUX in DP-AM-DAC by half make it easier extend bandwidth final...

A compact hybrid-integrated 100 Gb/s (4 lane × 25.78125 Gb/s) transmitter optical sub-assembly (TOSA) has been developed for a transceiver 40-km transmission over single-mode fiber. The TOSA simple configuration in which four electro-absorption modulator-integrated distributed feedback (EADFB) lasers are directly attached to the input waveguide end-face of silica-based arrayed grating (AWG) multiplexer without bulk lenses. To achieve high butt coupling efficiency between EADFB and AWG...

We have developed a compact hybrid-integrated four-lane <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times 25.8$ </tex-math></inline-formula> Gb/s transmitter optical sub-assembly (TOSA) for 100 transceiver 40-km transmission. The TOSA has simple configuration in which four-channel electroabsorption modulator integrated distributed feedback (EADFB) laser array is directly attached to the input...